Stardust

Stardust is a miracle stone and if you collect them all, your wish comes true. And I have a favor to ask you, why don't you give me the Stardust if you find some? Of course I didn't say for free. I'll give ya something rare that I found on my journey in return. Whaddaya think? Not bad huh?

”

-Martel

Stardust (スターダスト, Sutādasuto) are hidden collectibles scattered around the world. Stardust has no stated purpose until you meet Martel in Bale, where you can give her your current number of Stardust (while receiving details about Stardust), in exchange for rare and one-of-a-kind accessories. The final reward she gives you is the Vanishing Stone, which gives you access to Magician Faust, an optional boss on Disc 3.